Calcium hypochlorite

The most critical factor is the Available Chlorine content, which typically ranges from 65% to 70% for high-quality granular or tablet forms. Buyers must also verify the moisture content (usually <5-10%) to ensure stability and the particle size distribution to ensure even dissolution. For water treatment, ensure the product has low insolubility levels to prevent clogging of dosing equipment.

As a chemical used in water treatment and disinfection, it must often comply with NSF/ANSI Standard 60 for drinking water chemicals. For the European market, REACH registration is essential. Additionally, since it is a hazardous material, the manufacturer must provide a valid SDS (Safety Data Sheet) and the product must meet UN2880 (Hydrated) or UN1748 (Dry) classification standards for dangerous goods.

Calcium Hypochlorite is an unstable oxidizer that decomposes over time. Buyers should prioritize 'Hydrated' Calcium Hypochlorite, which is more stable during transport. Check for the addition of stability additives and ensure the packaging is UV-resistant and moisture-proof (typically HDPE drums). A high-quality product should maintain its chlorine strength with a loss of less than 10% per year when stored in a cool, dry environment.

Granules are preferred for rapid shock treatment in swimming pools or emergency water disinfection due to their fast dissolution rate. Tablets (20g or 200g) are designed for slow-release disinfection in chlorinators or skimmers, providing a steady chlorine level over several days. For industrial bleaching, powder or granular forms are typically used for easier mixing in large vats.

Calcium Hypochlorite is classified as Dangerous Goods (Class 5.1, Oxidizing Substances). It requires UN-certified packaging (usually plastic drums with inner liners). Shipping must be handled by carriers with DG (Dangerous Goods) licenses, and the cargo must be stored away from heat sources and organic materials to prevent spontaneous combustion. Always request a Container Load Inspection to ensure proper bracing and segregation.

Utilize the Secured Trading services on Made-in-China.com to ensure payment is only released upon proof of shipment. Before placing a bulk order, conduct a third-party factory audit to verify the supplier's Production License for Hazardous Chemicals. It is also highly recommended to hire an agency like SGS or Intertek to perform Pre-shipment Inspection (PSI) to test the actual available chlorine percentage.

Prices are heavily influenced by the cost of raw materials (lime and chlorine gas) and energy prices. Negotiate based on volume tiers, as ordering a full 20ft container (FCL) significantly reduces the per-unit shipping cost for hazardous goods compared to LCL. Ask for a validity period on quotes, as chemical prices can fluctuate weekly based on environmental protection policies in the manufacturing region.

Missing or incorrect Dangerous Goods Declarations can lead to heavy fines or cargo seizure at customs. Ensure the HS Code (typically 2828100000) is correctly declared. You must also ensure the Labeling complies with GHS (Globally Harmonized System) standards in the destination country, including the correct pictograms and signal words in the local language.